31993038836 has 24 divisors (see below), whose sum is σ = 61189324896. Its totient is φ = 14515693920.

The previous prime is 31993038823. The next prime is 31993038929. The reversal of 31993038836 is 63883039913.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 640571 + ... + 688706.

It is an arithmetic number, because the mean of its divisors is an integer number (2549555204).

Almost surely, 2^31993038836 is an apocalyptic number.

It is an amenable number.

31993038836 is a deficient number, since it is larger than the sum of its proper divisors (29196286060).

31993038836 is a wasteful number, since it uses less digits than its factorization.

31993038836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1329839 (or 1329837 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 53.

The spelling of 31993038836 in words is "thirty-one billion, nine hundred ninety-three million, thirty-eight thousand, eight hundred thirty-six".